Well, it's more pret-a-porter than haute couture, really, but still: Harper's Bazaar interviews a few Sesame Street style icons.
Side note/spoiler: I'm disappointed at the exclusion of Kermit the Frog. The omission of Miss Piggy is arguably forgivable in that she was specifically a Muppet Show fashionista; I don't know if she ever even made an appearance on Sesame Street. But Kermit? With current industry emphasis on eco-conscious "green" design and production, certainly Kermit is THE indispensable style icon of Muppetry, from Sesame Street to Carnaby Street to any rue in Paris.